Projection Display Light Source Driver Amplitude Control
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Solution Overview
Problem
Existing projection devices using black frame insertion technology waste power and decrease dynamic contrast ratio due to fixed backlight luminance during black state periods, leading to suboptimal image quality and increased power consumption.
Innovation Solution
A projection display device with an image processing module and light source driver that generates a light driving signal with varying segments during black state periods, where the average amplitude in the second segment is lower than in the image period, optimizing power usage and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If black frame insertion is implemented with fixed backlight luminance, then image quality is improved, but power consumption increases and dynamic contrast ratio decreases
Solution Approach 1:
The patent applies dynamics by transitioning from fixed backlight luminance to variable luminance that changes during different periods (image period and black state period). The backlight luminance is dynamically adjusted to be higher during image periods and lower during black state periods, resolving the contradiction between maintaining image quality and reducing power consumption.
Solution Approach 2:
The patent changes the parameter of backlight luminance from a fixed value to a variable value that depends on the temporal period. By changing the luminance parameter based on whether the system is in an image period or black state period, the patent achieves both improved image quality and reduced power consumption simultaneously.
2Manufacturing precision
If black frame insertion is implemented with fixed backlight luminance, then image quality is improved, but dynamic contrast ratio decreases
Solution Approach 1:
The patent applies dynamics by making backlight luminance variable rather than fixed. The luminance dynamically adapts to the temporal conditions, being higher during image periods to maintain image quality and lower during black state periods to enhance dynamic contrast ratio, thus resolving the contradiction between these two requirements.
Solution Approach 2:
The patent changes the backlight luminance parameter from fixed to variable, allowing it to change based on the operational period. This parameter change enables the system to maintain high image quality during image periods while achieving high dynamic contrast ratio during black state periods.
3Use of energy by moving object
If backlight luminance is reduced during black state period, then power consumption is reduced, but image brightness decreases
Solution Approach 1:
The patent segments the temporal period into distinct image periods and black state periods, applying different backlight luminance levels to each segment. During image periods, higher luminance maintains image brightness, while during black state periods, lower luminance reduces power consumption, resolving the contradiction between these opposing requirements.
Solution Approach 2:
The patent applies dynamics by making backlight luminance variable rather than fixed. The luminance dynamically adapts to the temporal conditions, being higher during image periods to maintain image brightness and lower during black state periods to reduce power consumption, thus resolving the contradiction between these two requirements.
Data Source
AI summary
A projection display device is disclosed herein. The projection display device includes an image processing module and a light source driver. The image processing module is configured for receiving an image data and generating a display signal which includes an image period and a black state period. The light source driver is configured for generating a light driving signal to drive a projection light source, wherein the light driving signal includes a first segment and a second segment in the black state period, and the average amplitude of the light driving signal in the second segment is lower than the average amplitude of the light driving signal in the image period. A driving method is disclosed herein as well.